How I can invoke locally my lambda using API Gateway Websocket $connect and $disconnect routes so I can debug them?

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How I can invoke locally my lambda using API Gatewat $connect and $disconnect routes so I can debug them?

Jul 7 '20 Comments: 2 Answers: 2

1

I try to use lambdas with my AWS websocket api gateway.

I have made the following template.yaml:

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: "On connect and on disconnect handler"
Parameters
  DB_HOSTName:
    Type: String
    Default: '0.0.0.0:3306'
    Description: Database host
  
  DB_USERName:
    Type: String
    default:  myuser
    Description: Database User

  DB_PASSWORDName:
    Type: String
    default:

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I try to run locallym an aws lambda that is triggered via API Gateway's websocket. Based upon this: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-using-start-api.html I tried to run it locally without a success.

Comments

[Rolf Streefkerk]

There's no local variant of the API Gateway v2 except for HTTP API's, there's no websocket support (yet). You'll need to emulate this yourself with a node Express server I'm afraid

[Dimitrios Desyllas]

At least how I can emulate the event that the websocket will trigger. I mean even though I cannot run locally websockets I can trigger lambda execution via:

sam local invoke ^Lambda_name^ --event event.json

So what should I place on event.json in order to emulate a $connect and $disconnect event that Api Gateway will trigger? Even if I use nodejs and websockets I will need to emulate these events but I have not idea how.

[Rolf Streefkerk]

either capture the event in your logs when you've deployed the API Gateway Websocket with Lambda integration. OR search on google what the event structure is for a WebSocket Lambda integration.